COMBLAIN-AU-PONT (BE)
Quarry blast8 July 2021
- Magnitude
- 1.0ML
- Depth
- –
- Belgian time
- 15:00:162021-07-08
- UTC
- 13:00:162021-07-08
Main parameters
| Date and time | 2021-07-08 13:00:16 UTC 2021-07-08 15:00:16 Belgian time |
|---|---|
| Magnitude | ML 1.0 |
| Epicentral coordinates | 50.473° N, 5.612° E Uncertainty ± 0.6 km |
| Event ID | ROB 13930 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-09 11:06:44 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 8
- Epicentral distance
- 18.5 – 54.5km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 8 measurements, root-mean-square deviation 0.19 s. S wave: 6 measurements, root-mean-square deviation 0.53 s.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)7 stations | |||||
| LCHLa Chartreuse | 18.5 | 357 | 13:00:20.26+3.51 s | – | – |
| CLAClavier | 22.8 | 255 | 13:00:20.83+4.08 s | 13:00:24.06+7.31 s | 3.23 |
| HOUHouvegnez | 30.9 | 115 | 13:00:22.56+5.81 s | 13:00:26.42+9.67 s | 3.86 |
| MEMHMembach | 32.0 | 62 | 13:00:22.74+5.99 s | 13:00:26.62+9.87 s | 3.88 |
| MRGMont Rigi | 33.1 | 82 | 13:00:22.55+5.80 s | 13:00:26.87+10.12 s | 4.32 |
| TNLTernell | 38.8 | 71 | 13:00:23.60+6.85 s | – | – |
| KLBKalborn | 54.5 | 139 | 13:00:26.83+10.08 s | 13:00:32.93+16.18 s | 6.10 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 39.5 | 35 | 13:00:23.81+7.06 s | 13:00:30.12+13.37 s | 6.31 |